21089120884 has 12 divisors (see below), whose sum is σ = 39744881764. Its totient is φ = 9733440384.

The previous prime is 21089120881. The next prime is 21089120903. The reversal of 21089120884 is 48802198012.

It can be written as a sum of positive squares in 2 ways, for example, as 3066058384 + 18023062500 = 55372^2 + 134250^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21089120884.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21089120881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202779957 + ... + 202780060.

Almost surely, 2^21089120884 is an apocalyptic number.

It is an amenable number.

21089120884 is a deficient number, since it is larger than the sum of its proper divisors (18655760880).

21089120884 is a wasteful number, since it uses less digits than its factorization.

21089120884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405560034 (or 405560032 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 43.

The spelling of 21089120884 in words is "twenty-one billion, eighty-nine million, one hundred twenty thousand, eight hundred eighty-four".